Measurement of impact-induced delamination buckling in composite laminatesHigh-velocity impact tests were performed on graphite/epoxy laminates with embedded delaminations. High-speed photography of the transversely impacted laminates shows that dynamic local buckling of the sublaminate region formed by the delamination can cause a mode-I-dominated propagation of that delamination. Simultaneous recordings of the dynamic strain histories at several locations in the buckled sublaminate region are used to measure the laminate and sublaminate responses to the impact loading. Flexural motion resulting from transverse impact is shown to reduce local buckling of the sublaminate. This buckling causes a progressive separation of the delaminated surfaces and subsequent extension of the delamination in a mode-I dominated fashion.
Document ID
19880059987
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Grady, J. E. (NASA Lewis Research Center Cleveland, OH, United States)
Depaola, K. J. (NASA Lewis Research Center Cleveland, OH, United States)